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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* Copyright (c) 2016-2021 VMware Inc. or its affiliates, All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package reactor.adapter;
import java.util.concurrent.Flow;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Scannable;
import reactor.core.publisher.Flux;
/**
* Convert a Java 9+ {@literal Flow.Publisher} to/from a Reactive Streams {@link Publisher}.
*
* @author Stephane Maldini
* @author Sebastien Deleuze
*/
@SuppressWarnings("Since15")
public abstract class JdkFlowAdapter {
/**
* Return a java {@code Flow.Publisher} from a {@link Flux}
* @param publisher the source Publisher to convert
* @param the type of the publisher
* @return a java {@code Flow.Publisher} from the given {@link Publisher}
*/
public static Flow.Publisher publisherToFlowPublisher(final Publisher
publisher) {
return new PublisherAsFlowPublisher<>(publisher);
}
/**
* Return a {@link Flux} from a java {@code Flow.Publisher}
*
* @param publisher the source Publisher to convert
* @param the type of the publisher
* @return a {@link Flux} from a java {@code Flow.Publisher}
*/
public static Flux flowPublisherToFlux(Flow.Publisher publisher) {
return new FlowPublisherAsFlux<>(publisher);
}
private static class FlowPublisherAsFlux extends Flux implements Scannable {
private final java.util.concurrent.Flow.Publisher pub;
private FlowPublisherAsFlux(java.util.concurrent.Flow.Publisher pub) {
this.pub = pub;
}
@Override
public void subscribe(final CoreSubscriber super T> actual) {
pub.subscribe(new SubscriberToRS<>(actual));
}
@Override
public Object scanUnsafe(Attr key) {
return null; //no particular key to be represented, still useful in hooks
}
}
private static class PublisherAsFlowPublisher implements Flow.Publisher {
private final Publisher pub;
private PublisherAsFlowPublisher(Publisher pub) {
this.pub = pub;
}
@Override
public void subscribe(Flow.Subscriber super T> subscriber) {
pub.subscribe(new FlowSubscriber<>(subscriber));
}
}
private static class FlowSubscriber implements CoreSubscriber, Flow.Subscription {
private final Flow.Subscriber super T> subscriber;
Subscription subscription;
public FlowSubscriber(Flow.Subscriber super T> subscriber) {
this.subscriber = subscriber;
}
@Override
public void onSubscribe(final Subscription s) {
this.subscription = s;
subscriber.onSubscribe(this);
}
@Override
public void onNext(T o) {
subscriber.onNext(o);
}
@Override
public void onError(Throwable t) {
subscriber.onError(t);
}
@Override
public void onComplete() {
subscriber.onComplete();
}
@Override
public void request(long n) {
subscription.request(n);
}
@Override
public void cancel() {
subscription.cancel();
}
}
private static class SubscriberToRS implements Flow.Subscriber, Subscription {
private final Subscriber super T> s;
Flow.Subscription subscription;
public SubscriberToRS(Subscriber super T> s) {
this.s = s;
}
@Override
public void onSubscribe(final Flow.Subscription subscription) {
this.subscription = subscription;
s.onSubscribe(this);
}
@Override
public void onNext(T o) {
s.onNext(o);
}
@Override
public void onError(Throwable throwable) {
s.onError(throwable);
}
@Override
public void onComplete() {
s.onComplete();
}
@Override
public void request(long n) {
subscription.request(n);
}
@Override
public void cancel() {
subscription.cancel();
}
}
JdkFlowAdapter(){}
}
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